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參數(shù)資料
| 型號： | TPS62677YFDR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PBGA6 |
| 封裝： | 0.40 MM HEIGHT, DSBGA-6 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 750K |
| 代理商： | TPS62677YFDR |
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DIL +
V
O
V
I
V
I *
V
O
L
sw
DIL(MAX) + IO(MAX) )
DIL
2
www.ti.com
SLVS952 – APRIL 2010
APPLICATION INFORMATION
INDUCTOR SELECTION
The TPS6267x series of step-down converters have been optimized to operate with an effective inductance
value in the range of 0.3mH to 1.8mH and with output capacitors in the range of 2.2mF to 4.7mF. The internal
compensation is optimized to operate with an output filter of L = 0.47mH and CO = 2.2mF. Larger or smaller
inductor values can be used to optimize the performance of the device for specific operation conditions. For more
details, see the CHECKING LOOP STABILITY section.
The inductor value affects its peak-to-peak ripple current, the PWM-to-PFM transition point, the output voltage
ripple and the efficiency. The selected inductor has to be rated for its dc resistance and saturation current. The
inductor ripple current (
ΔIL) decreases with higher inductance and increases with higher VI or VO.
with: fSW = switching frequency (6 MHz typical)
L = inductor value
ΔIL = peak-to-peak inductor ripple current
IL(MAX) = maximum inductor current
(4)
In high-frequency converter applications, the efficiency is essentially affected by the inductor AC resistance (i.e.
quality factor) and to a smaller extent by the inductor DCR value. To achieve high efficiency operation, care
should be taken in selecting inductors featuring a quality factor above 25 at the switching frequency. Increasing
the inductor value produces lower RMS currents, but degrades transient response. For a given physical inductor
size, increased inductance usually results in an inductor with lower saturation current.
The total losses of the coil consist of both the losses in the DC resistance (DC)) and the following
frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
The following inductor series from different suppliers have been used with the TPS6267x converters.
Table 1. List of Inductors
MANUFACTURER
SERIES
DIMENSIONS (in mm)
LQM21PN1R0NGR
2.0 x 1.2 x 1.0 max. height
LQM21PNR47MC0
2.0 x 1.2 x 0.55 max. height
MURATA
LQM21PN1R0MC0
2.0 x 1.2 x 0.55 max. height
LQM18PN1R5-B35
1.6 x 0.8 x 0.4 max. height
LQM18PN1R5-A62
1.6 x 0.8 x 0.33 max. height
PANASONIC
ELGTEAR82NA
2.0 x 1.2 x 1.0 max. height
SEMCO
CIG21L1R0MNE
2.0 x 1.2 x 1.0 max. height
BRC1608T1R0
1.6 x 0.8 x 0.9 max. height
BRC1608T1R5
1.6 x 0.8 x 0.9 max. height
TAIYO YUDEN
CKP1608L1R5M
1.6 x 0.8 x 0.55 max. height
CKP1608U1R5M
1.6 x 0.8 x 0.4 max. height
TDK
MLP2012SR82T
2.0 x 1.2 x 0.6 max. height
TOKO
MDT2012-CR1R0A
2.0 x 1.2 x 1.0 max. height
Copyright 2010, Texas Instruments Incorporated
21
Product Folder Link(s): TPS6267x
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